Zobrazeno 1 - 10
of 2 161
pro vyhledávání: '"Afonso,J"'
Autor:
Broderick, J. W., Seymour, N., Drouart, G., Knight, D., Afonso, J. M., De Breuck, C., Galvin, T. J., Hedge, A. J., Lehnert, M. D., Noirot, G., Shabala, S. S., Turner, R. J., Vernet, J.
We present deep near-infrared $K_{\rm s}$-band imaging for 35 of the 53 sources from the high-redshift ($z > 2$) radio galaxy candidate sample defined in Broderick et al. (2022). These images were obtained using the High-Acuity Widefield $K$-band Ima
Externí odkaz:
http://arxiv.org/abs/2407.19145
Autor:
Whittam, I. H., Prescott, M., Hale, C. L., Jarvis, M . J., Heywood, I., An, Fangxia, Glowacki, M., Maddox, N., Marchetti, L., Morabito, L. K., Adams, N. J., Bowler, R. A. A., Hatfield, P. W., Varadaraj, R. G., Collier, J., Frank, B., Taylor, A. R., Santos, M. G., Vaccari, M., Afonso, J., Ao, Y., Delhaize, J., Knowles, K., Kolwa, S., Randriamampandry, S. M., Randriamanakoto, Z., Smirnov, O., Smith, D. J. B., White, S. V.
In this paper we combine the Early Science radio continuum data from the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) Survey, with optical and near-infrared data and release the cross-matched catalogues. The radio data used in
Externí odkaz:
http://arxiv.org/abs/2310.17409
Autor:
Carvajal, R., Matute, I., Afonso, J., Norris, R. P., Luken, K. J., Sánchez-Sáez, P., Cunha, P. A. C., Humphrey, A., Messias, H., Amarantidis, S., Barbosa, D., Cruz, H. A., Miranda, H., Paulino-Afonso, A., Pappalardo, C.
Publikováno v:
A&A 679, A101 (2023)
We developed and trained a pipeline of three machine learning (ML) models than can predict which sources are more likely to be an AGN and to be detected in specific radio surveys. Also, it can estimate redshift values for predicted radio-detectable A
Externí odkaz:
http://arxiv.org/abs/2309.11652
Autor:
Antunes e Sousa, Guilherme J.1,2 (AUTHOR) gui.sousa@ua.pt, Silva, Afonso J. C.1,2 (AUTHOR) afonso.carvalho.silva@ua.pt, Serra, Gabriel F.1,2 (AUTHOR) gfserra92@ua.pt, Fernandes, Fábio A. O.1,2 (AUTHOR) fabiofernandes@ua.pt, Silva, Susana P.3 (AUTHOR) susana.silva@amorim.com, Alves de Sousa, Ricardo J.1,2 (AUTHOR) rsousa@ua.pt
Publikováno v:
Materials (1996-1944). Oct2024, Vol. 17 Issue 19, p4772. 22p.
Autor:
Hale, C. L., Whittam, I. H., Jarvis, M. J., Best, P. N., Thomas, N. L., Heywood, I., Prescott, M., Adams, N., Afonso, J., An, Fangxia, Bowler, R. A. A., Collier, J. D., Cook, R. H. W., Davé, R., Frank, B. S., Glowacki, M., Hatfield, P. W., Lovell, S. Kolwa C. C., Maddox, N., Marchetti, L., Morabito, L. K., Murphy, E., Prandoni, I., Randriamanakoto, Z., Taylor, A. R.
We present deep 1.4 GHz source counts from $\sim$5 deg$^2$ of the continuum Early Science data release of the MeerKAT International Gigahertz Tiered Extragalactic Exploration (MIGHTEE) survey down to $S_{1.4\textrm{GHz}}\sim$15 $\mu$Jy. Using observa
Externí odkaz:
http://arxiv.org/abs/2211.05741
Autor:
Whittam, I. H., Jarvis, M. J., Hale, C. L., Prescott, M., Morabito, L. K., Heywood, I., Adams, N. J., Afonso, J., An, Fangxia, Ao, Y., Bowler, R. A., Collier, J. D., Deane, R. P., Delhaize, J., Frank, B., Glowacki, M., Hatfield, P. W., Maddox, N., Marchetti, L., Matthews, A. M., Prandoni, I., Randriamampandry, S., Randriamanakoto, Z., Smith, D. J. B., Taylor, A. R., Thomas, N. L., Vaccari, M.
We study the nature of the faint radio source population detected in the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) Early Science data in the COSMOS field, focusing on the properties of the radio-loud active galactic nuclei
Externí odkaz:
http://arxiv.org/abs/2207.12379
Autor:
Efstathiou, A., Farrah, D., Afonso, J., Clements, D. L., González-Alfonso, E., Lacy, M., Oliver, S., Lesta, V. Papadopoulou, Pearson, C., Rigopoulou, D., Rowan-Robinson, M., Spoon, H. W. W., Verma, A., Wang, L.
Publikováno v:
2022MNRAS.512.5183E
We present the ultraviolet to submillimetre spectral energy distributions (SEDs) of the HERschel Ultra Luminous Infrared Galaxy Survey (HERUS) sample of 42 local ultraluminous infrared galaxies (ULIRGs) and fit them with a Markov chain Monte Carlo (M
Externí odkaz:
http://arxiv.org/abs/2205.00011
Autor:
Broderick, J. W., Drouart, G., Seymour, N., Galvin, T. J., Wright, N., Rosell, A. Carnero, Chhetri, R., Dannerbauer, H., Driver, S. P., Morgan, J. S., Moss, V. A., Prabu, S., Afonso, J. M., De Breuck, C., Emonts, B. H. C., Franzen, T. M. O., Gutiérrez, C. M., Hancock, P. J., Heald, G. H., Hurley-Walker, N., Ivison, R. J., Lehnert, M. D., Noirot, G., Read, M., Shabala, S. S., Stern, D., Sutherland, W. J., Sutorius, E., Turner, R. J., Vernet, J.
While unobscured and radio-quiet active galactic nuclei are regularly being found at redshifts $z > 6$, their obscured and radio-loud counterparts remain elusive. We build upon our successful pilot study, presenting a new sample of low-frequency-sele
Externí odkaz:
http://arxiv.org/abs/2204.08490
Autor:
Seymour, N., Drouart, G., Noirot, G., Broderick, J. W., Turner, R. J., Shabala, S. S., Stern, D. K., Bellstedt, S., Driver, S., Davies, L., De Breuck, C. A., Afonso, J., Vernet, J. D. R., Galvin, T. J.
We present Hubble Space Telescope Wide Field Camera 3 photometric and grism observations of the candidate ultra-high-redshift (z>7) radio galaxy, GLEAM J0917-0012. This radio source was selected due to the curvature in its 70-230 MHz, low-frequency M
Externí odkaz:
http://arxiv.org/abs/2203.01349
Autor:
Heywood, I., Jarvis, M. J., Hale, C. L., Whittam, I. H., Bester, H. L., Hugo, B., Kenyon, J. S., Prescott, M., Smirnov, O. M., Tasse, C., Afonso, J. M., Best, P. N., Collier, J. D., Deane, R. P., Frank, B. S., Hardcastle, M. J., Knowles, K., Maddox, N., Murphy, E. J., Prandoni, I., Randriamampandry, S. M., Santos, M. G., Sekhar, S., Tabatabaei, F., Taylor, A. R., Thorat, K.
MIGHTEE is a galaxy evolution survey using simultaneous radio continuum, spectro-polarimetry, and spectral line observations from the South African MeerKAT telescope. When complete, the survey will image $\sim$20 deg$^{2}$ over the COSMOS, E-CDFS, EL
Externí odkaz:
http://arxiv.org/abs/2110.00347